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hybrid cartridge protoype without burst disk

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 06, 2011 6:53 pm

warhead052 wrote:Having fun waiting for the epoxy to cure? Or are you getting on edge?


Not really, I have a couple of hours sleep and a day of work to keep me distracted in the meatime ;)
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Unread postAuthor: POLAND_SPUD » Wed Jul 06, 2011 6:56 pm

I'm giving this valveless design a go
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wouldn't you need a notch on each of teh disks to screw them in ?
though I guess you realize that
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 06, 2011 6:59 pm

The longer one will be permanently epoxied in place, I'll cut... nay, mill a notch in the shorter one to fit a screwdriver ;)
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Unread postAuthor: Gun Freak » Wed Jul 06, 2011 9:24 pm

The thought of you getting a lathe makes me so happy :lol:
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Unread postAuthor: warhead052 » Wed Jul 06, 2011 9:59 pm

So jack, are you going to use a 5x mix? or 10x?
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Unread postAuthor: Gun Freak » Wed Jul 06, 2011 10:28 pm

I'm sure he'll use as high as possible, maybe 15-20 or higher, but there's no way to predict the pop pressure of this design without testing first so we have to wait till the epoxy cures to find out what mix he's using. Hopefully that o-ring will tighten up enough for a 25-30x mix.
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Unread postAuthor: MrCrowley » Wed Jul 06, 2011 10:57 pm

Damn, it looks so coitus-y :shock:
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 07, 2011 12:27 am

Gun Freak wrote:The thought of you getting a lathe makes me so happy :lol:


You have no idea how warm and tingly it makes me inside :) and I've only had it for just under two weeks!

warhead052 wrote:So jack, are you going to use a 5x mix? or 10x?


Gun Freak summed it up, the chamber volume in this case is tiny so I'm hoping to go the whole 28x or so available with syinge metering for decent power.

MrC wrote:Damn, it looks so coitus-y


Thanks... but you're the temporary custodian of the fabled MiniBoy of legend, your standards for coitus-y should be sky high ;)

Updated the diagram to reflect actual construction:
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Unread postAuthor: Crna Legija » Thu Jul 07, 2011 5:03 am

did you use the lathe to roughen up the epoxied part?
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 07, 2011 7:06 am

Crna Legija wrote:did you use the lathe to roughen up the epoxied part?


Naturally :)

I'm not convinced it's going to hold pressure because of the way the o-ring is supported, it might need a more sophisticated mount. We'll see, testing later today.
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Unread postAuthor: POLAND_SPUD » Thu Jul 07, 2011 7:35 am

it might need a more sophisticated mount
I'd be more worried about keeping the pellet in place rather than leakage

test this one and if it won't work you might add two mounts - one for o-ring that keeps seals and one for a washer (or some o-ring made of harder material) to keep the pellet from popping
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 07, 2011 7:49 am

POLAND_SPUD wrote:I'd be more worried about keeping the pellet in place rather than leakage


As mentioned elsewhere, I doubt it will be an issue.
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Unread postAuthor: warhead052 » Thu Jul 07, 2011 8:13 am

Well this shall be an interesting video. Just in case the epoxy blows out the back of it, film it on high speed!
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 07, 2011 3:05 pm

Just as I feared, I was unable to get it to seal. I tried boring it out to 6mm from the original 5.5mm and use it with an airsoft BB but to no avail.

This needs some more thought, and maybe a change of attitude towards design.
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Unread postAuthor: POLAND_SPUD » Thu Jul 07, 2011 11:43 pm

Have you tried cylindrical ammo?
well I mean anything that will fit in there
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